Degradation Mechanism of Amorphous Silicon Carbide Fiber due to Air-Exposure at High Temperatures
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- Morishita Kohei
- Department of Materials Science and Engineering, Kyoto University
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- Matsumoto Tasuku
- Department of Fundamental Energy Science, Kyoto University
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- Ochiai Shojiro
- International Innovation Center, Kyoto University
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- Okuda Hiroshi
- International Innovation Center, Kyoto University
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- Ishikawa Toshihiro
- Ube Research Laboratory, Ube Industries Ltd
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- Sato Mitsuhiko
- Ube Research Laboratory, Ube Industries Ltd
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The degradation mechanism of the amorphous silicon carbide fiber, Tyranno-ZMI®, exposed in air at 1173∼1873 K for 20 ks were studied. The average strength of the bare fiber, which was prepared by etching away the oxidation layer on the fiber surface, decreased with increasing exposure temperature, especially when exposed at the temperature higher than 1673 K. The measurement of the crystallite size of β-SiC in the fiber with Sherrer method revealed that coarsening of the crystalline occurred in the fiber exposed at the temperatures higher than 1773 K. The scanning electron microscope observation of the fiber surface showed that the many defects formed on the fiber surface. By introducing an artificial notch directly into the fiber specimens using a focused-ion(Ga+)-beam, the fracture toughness values of the as-supplied fiber and of the fiber exposed at 1673 and 1773 K were determined to be 1.8±0.3, 1.9±0.4 and 1.3±0.4 MPa\sqrtm, respectively. Based on these results, the reason for the degradation of the fiber was attributed to the extension of the surface defect which was enhanced by the reduction in fracture toughness due to coarsening of the β-SiC crystalline.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 48 (2), 111-116, 2007
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390001204250957312
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- NII論文ID
- 10018508426
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 8623498
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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